Do-Hoon sets his eyes on his target; it's Mrs. Lee So-hee's youngest daughter Han Ah-young. He invites her to talk over dinner. Before time got late, he sends her home earlier than expected & planned to meet next weekend. When the time came, they went on a date together, and at the end of the day, they go to a motel together, and they get straight to having sex where Do-hoon takes Ah-young's virginity. He starts fucking her gently and very considerately, but she wants to fuck her the way he likes (roughly) to get him to like her.
After a boring sex session with her husband, Yoosun wants to get a taste of real dick from her husband's brother who was right behind her room's door waiting to fuck her.
Ga-yung takes Kyung-Ho with her to see something interesting...it's a couple fucking outdoor. They get her all fired up and so she initiates the sex despite Kyung-Ho not being comfortable doing it outside.